Ford Focus, 63

By at least one estimate, the Ford Focus is the best-selling car in the world. The Focus has an American content rating of 63, but the electric version gets a higher rating of 70.

By at least one estimate, the Ford Focus is the best-selling car in the world. The Focus has an American content rating of 63, but the electric version gets a higher rating of 70. (Justin Sullivan / Getty Images)

By at least one estimate, the Ford Focus is the best-selling car in the world. The Focus has an American content rating of 63, but the electric version gets a higher rating of 70.